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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce80e3b0d61653bb53fe65ea055f0814a26ee0f4f33d4e2e9a859194d5442f0' 
  AND token = 'ruPvo/eSdJboejc0SOcssYFQjh8twJKgwRxl7jaKxis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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