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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71e2a84c01dc2b2aca8fffc148e5bba399490189308e91f2688abf766b866b6' 
  AND token = 'gE2brZajpzzBoP4E5/DwkocD6FtxjRm4K5mg5aKQI1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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