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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7f5fe15aed73395e9ed403e37135cb3e56a1c6627887bb3f8ad20b77a8511f' 
  AND token = 'gPMzrzS/sg8sIbpSLNGAHx4K6asHnZizKc8dn3x5lcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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