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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf4e7c0eba23ef21c6a35428a0b1871c5eed67e6371909ca713e3d6da0b08ea' 
  AND token = 'eAOdeUq/HQP2ONMtZJXREmLWa7Do/8VhdJNyRYBiIbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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