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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d6066159dda849b09a746bca2c8a1287a639feb662a0f8fdba6fa89a0637b0' 
  AND token = 'PAw7M0+OjRZ5F0JXp/qCexmfOBe3lgENPebPtLhtNO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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