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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd6417b6509535cee40835e370179dd4d0896d411f9225d49fc1e15615e3ee0' 
  AND token = 'inFubjkLQfRBP3/Dw7FoiUpjVbINsYbV0/8NhMAU/x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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