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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcce8f38d2342f8f12cc5c47032618d9663a0770513828b212d08fe890ba9ab' 
  AND token = 'MAcaddt8FuiylpWo8MXXBE0+gebQVjLz2t0IjNo27WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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