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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1e3ef8fde57bd47798b0680f3b10b42aea996279a27051c599ae80ecddb0a1' 
  AND token = 'UrIkNgLVRJDzRKpPdD+n1p7JIXqssvJVClzOM662Nfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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