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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397e86a91adf06e2ee596ad27b66f17414befa84a91823a7fb6681a517001982' 
  AND token = 'GEi1mLYb7YA295ymRl5fkvA9HObWSCSnmuEzldKlLqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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