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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a0f53390ec08910a409cb6d30f8ac6635423bad495daf4f0046623377398fc' 
  AND token = 'khDCNKPeOcwRqgQR2aagibo0iU46fdaZ9ywgf+1CPVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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