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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ea6b40a29cd0b98b4d377188d0a5cf05676fb05c7348796fbad6df649cc0e9' 
  AND token = '/ypdSj0eIhawKrLa7UQ436teJ9MVuDYLd4w9WWDCSqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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