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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaaddc0e1a182c67f20421554a2deea6e476dfba199bb726954c53f9897bc3ab' 
  AND token = 'VSiYZ6Ug74fndl54RRLBXG3DiVxv0DiaOnCWANcM6D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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