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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa31295adc1bead5eeeeeed0ce3fa706c2f7d34788a28502b1eeb0eadab7852' 
  AND token = 'Uq+r6AXAub9O/i65kmAPZB/3EipZTi/b/0IjBFwQ/Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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