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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e6bd87eb794e552cf85a6d00b8214232fc6e86e2aa8cc7753cadb756d224f7' 
  AND token = 'XYvbM25Ds42QG4eLK0AGfSTakv7xo3eB7fNtuL952Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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