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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abe5da6de47d560a046511bc8c15c01acc60badf77f08d6e2ca40735aea4675' 
  AND token = 'nTEbdDNbqn9fwW7vL0ZwORLwzx0sYgaon3YMFH+FumY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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