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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af852ddf7e085ba9e97dfd17b0dd47a0bee6bb579dee22e9a189110e561d469' 
  AND token = 'nmQF0XSitSmqwlejKky5Yn8+Mu4JkON60rNSMbGMgpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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