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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea378b9daa3085e23d0160104b7bc92d9ee57a6de43d41e2a4c91fa69bc4a8cf' 
  AND token = '5fD5CxShF3DHo7biqEqcYL2tm9YFZTm7riCyrzXLVj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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