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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0734ffccb7050ad0f354386857718b0801d3fcf7ad477ab3bf09ff5fa633b2a' 
  AND token = 'FlMEukMa5IIEn5FEayEZEvjj87ztQuG72NO1L4j8jwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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