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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0ce0be4bec5dde5b89ce6aecd76224d7e1be41d3e50417e9b409a5f9e82f0c' 
  AND token = 'xeKg3xN59W6aZWxGN3fADWYIyOWz2rqPbJk2ro9LSdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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