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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc54e601dd9da76b35627ce2dfc61e6fb47053f3336122678daa750a0fc239ce' 
  AND token = 'N4xnyvsfibKQoeXPstlVZh0cDLXPMLQ+3j3HPkM8+9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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