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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40012bd5eeb43eefb23424c9b969bf8596a848d0caabd31e231fcc9042a39752' 
  AND token = 'vWLCgqeuUYuSbE28PbsBlCvceQgSOtGbnbyVA+g20nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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