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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5356eec91b77dbbc3916d5a21e3aec65dd12a0be5b020ae0b78b4d4275ff60f2' 
  AND token = 'I5/EgeOepJg2ndqbbu1J4AM70KK6hoUR/BS1fxpydhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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