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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5081d066ea2612efbfa2ff08a2ec4446600054eda66c3ee75aeeffe600dd9ca5' 
  AND token = 'jTDnhsYQASv6XczMY8+JjmDhE5gmXS1o9M8xnL5Lcuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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