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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0876a6c0d40bd9288d6e9414a6bc638659d572817925038db95d6a0777328924' 
  AND token = 'tn2n5si0eIc374/d5hT7+lgcnwpNJ7694IBp3DOf8VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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