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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ef8b7850b8c7b7a908069affb334dd54b56cd86ba905c3f7942c4225a4d0fd' 
  AND token = '8cmuwF3/O3879CXFOSxA1SbXsPDeh3e8yAMPcgPa8kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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