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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725c4b1b5ad57c906d5c57d8b42c7210d68c8ae2fefb0dd4df403ec08586319c' 
  AND token = 'lMR3vyxIW7OR25dLd7yV/akmp1DFjhInas5b/1Ziyrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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