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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198e2eba892277dcbe9a016c4c6af20f1380258846f0c02a7a2dda31c65ba34e' 
  AND token = '+l0FW/q+Lq7p+Z5V+3gTzLyTTiWMpaRBPsWa5ugaCwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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