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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7196a3c0cc40c6826b92daaefccf971767a6e16b8348623ff197faace1c23b1d' 
  AND token = 'bsmGioghFwP9tLs4Hh23RKe4ENmMfS0Y3i5lpPnnZ94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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