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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa1e771f1ad66b41f17a04f33d96990bfa86c659b7b2e7dc764a38332d9e095' 
  AND token = 'eFcXpwADei9L7+TEeC8NJtQonnso+Xr5c/iKI24nM10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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