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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2320992980b35eeb7f619104b6fee62f571ccf0485f06234d8b08d9ae06571' 
  AND token = '7t0XUePs83DdN8NfL3Atg4Th70sGRgh/HS7G79SLf7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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