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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2378317c80f5fbcb0c1f360efdf87dcf9ad9e677e205f4f8ca4ee5d2ccfc87' 
  AND token = '6ErU211Lyl7QVOYvI0Qkgs8zoCjIgEq7KKpVXP+Ktx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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