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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcac0698d341cd318a2fe6edb62f82fbeacaa3a0ef48d49bb1fdc72b93736bd6' 
  AND token = 'L3XdTe3ziNKzhGmjU6in8X+I7n2/1YE5AcFGm2/8oL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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