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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecfa2f963a673da6deea1d8fc043f22d1932fb773bbc795b76d0e96a90f055c' 
  AND token = 'N5uvdc7h2EMGK4+N5ygc4cm2mSwyQzUyB8cYmG2gI1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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