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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ec695d52e68d4db6eef5e475707325605ae35280ccdfffc6af57c83872441f' 
  AND token = 'MNs5MVqdpyHhVWDyTm9ZgCdMnHxKC3r7pLlmXIQUzZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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