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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef5a4f590deff23a91c58e588ce51375af6c334eefc4676179a851e6bd9feef' 
  AND token = 'lp1s8A+5mYgSu4btGxXxIH3ZR1AKS1qTXELTdqiQwCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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