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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '428025430133a17dcf5b331ee623ab46f76149909a1827a525b9674fcb1ea94d' 
  AND token = 'eUmtK04b1og6bxxekQn0OsX3p+ifcFbzbjYtys3Uf8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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