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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd19e965d5c25d2e2639cca5df9141cb82050cb2768fe5796be04a6b81e2c08' 
  AND token = '/tGp8SeDXUQ2Cpbi+hjhL+4ZPTupu2dFumY0srrG0Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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