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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f3324c14a2775361fb80354210400ef3378818e2606fdeaa453126b0695c5e' 
  AND token = 'jn08dIewKda+2xZPgcl6l1Uc85CoXV4q2s6MGEFGF6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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