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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2df58e1103ae93cc5584b868796e7095bef2b19068eb3c371735f35af912a7' 
  AND token = 'kcFTUWTxghX2JeAwWk6ps4kDTIIRyAk/FBCioZhzG2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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