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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947fb8e6ded81dd2f590d1928c4f40bed2109dc24a6d2439bdb3f56e53f79831' 
  AND token = 'IqDB35FD6Lgf6UdT/L9oWW3FePZAduK2wdWmALz+yTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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