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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9703887f9508f6890a8f448acbbf352910e9090206d2c5156ee855ed3f5068ef' 
  AND token = 'L0w7sR5QWWE9L3O+PPX4s2E+d/CcCDz8CXlA1k/t4jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}