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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155eaaa20b2d2d83979524add69e8162b9d3d0ecfc07dfeed17c3fad2056e1d2' 
  AND token = 'soUkzf0ad2Ktw7ovSW8w8z1VASSVYdISKPAx9Z0xfgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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