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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd32c6f4304086397ddfd451ec7112ee75cb03ae6101ebe2d8ab3a90c4b79c7' 
  AND token = '4mPh77Z2rIlocHJ6fAmiHfpzn4fLB+Bx/rTc7OksIyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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