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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02eb743ea0976c9728b08c73f186067c642d0c3cde66e9a380bd86b010f14701' 
  AND token = 'exjBwLJc/dNGkHkCm7ppDyxLGon9ycG7acEhaJMlEbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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