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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea33282aa603f1ca26e58b3f92e8d37d84e12f03351552179a81207ae58584a' 
  AND token = 'teFfP3r2NE9w9hfFKnCIijoKEzSDF/Q9wB9na1hUnCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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