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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008deb6caab89f43363e9106ce64a44c5563fc0575b8031658f97f28e411d894' 
  AND token = 'TwAKR/QqC6stpHpOSNLmA3Nl8+u1kUgFS3mJdQvtvbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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