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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40eed137f4c38535dbf7d65a599e4751ecdba9a786cdc7e27cc82938008fb69' 
  AND token = '+oTM/r63bjMxR8Kb686+cuRP/gOuLqqnjnkDkqwdYwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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