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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f15f78662f24b7346b7913a40e84d9ab2fbce9201af4b9fab9e0c26c7b4facf' 
  AND token = 'vPaUHeGrjIuIs6O6NTYXKbWyg5iX5l2gQLFoecC4IDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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