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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e8ed020aace1614b2e391ebaea6e92b4922c491e7baa6ff8285bebe1973d44' 
  AND token = 'z4EVS9i+oHSungcaGe7kIPSXyYU1RTvE3ThoRQA7+9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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