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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88b33f5f7806a9a4e00c92191e61e1aa772311781e3e39d2112af42b546db39' 
  AND token = 'ttVqA+ApX7hznBN0Bohs4YTNhzhx9hFjP58Wpdsw9J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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