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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89da444d26766cddee7438c2c4513b9474b07ed11433d4c8c4664b49e2c23bb3' 
  AND token = 'VZwbj6BgNhlyBRd6k2X7/R6M0hUyHZwNKikI+ILQejg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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