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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88d740c66255f68a2bef020ec31c74221e9520bcaea1eca84b468dfed5bcd02' 
  AND token = 'FGtLBKyUi2GTPw4ml6GGpnsCrX6iz5TKGxP/QICdJSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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