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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2e62a92a21138fc64fe349769886f944e0c851dd04747a45a13b273c6a64ef' 
  AND token = '3Wu2OOUF2PkO12HlInMjDfovfChpFG0x4pvTMvHMI+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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