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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ef40830d5f740739c6de36b09c62f5801440d12c43b48be5e35060ec01b1bb' 
  AND token = 'pYG3hGF4Pryy2hfI8M2iJaO3lorXkA96oE5tVMF0v8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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