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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8573d854424a291166cab9406950bb1a2ac02307a0da88c11bd93a8cb5954a86' 
  AND token = 'iurug348a04RpJzJ9e8Z3ygeimmZ48LUZbvVKoJvRNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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