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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcc168009e91b3da6576b0dcae4b3782e4aecbef0ad6a1ee121569b701962f2' 
  AND token = 'AGdnQeQfNp0N4gLH3dYZ/usGnR/Rw2CaWPI0KboZJFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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