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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848042bf9ddceeaa2e5d3b3f52fff229c98fba1a5f60ba482464f255269437d9' 
  AND token = 's7HPs/Vqd5bjtZ3cX7di4WC/5nzFedTbqMcJ2pXhzp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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